The 20 Best Long Underwear

The The 20 Best Long Underwear of 2026, Reviewed and Compare

  • Sep 2, 2026
  • GetBestProduct Team

Top Picks

Smartwool Men's Classic Thermal Merino Base Layer Bottom

Smartwool Men's Classic Thermal Merino Base Layer Bottom

Pros

  • Excellent thermal insulation, making it suitable for very cold climates.
  • Breathable material that effectively wicks moisture away from your skin.
  • Slim fit offers a stylish silhouette without compromising on mobility.
  • Soft texture is comfortable against the skin, perfect for all-day wear.
  • Durable construction that withstands wear and tear from outdoor activities.

Cons

  • Higher price point compared to synthetic alternatives.
  • Limited color options may not appeal to everyone.
  • Requires special care, including hand washing or gentle cycle to maintain the fabric's integrity.

Key Features

  • Material: Made from high-quality Merino wool, offering superior warmth and moisture-wicking capabilities.
  • Fit: Slim fit design that allows for unrestricted movement through the arms and chest, ideal for active adventurers.
  • Thermal Performance: Midweight fabric that is perfect for cold-weather activities, ensuring breathability while keeping you warm.
  • Moisture Management: Each fiber in the Merino wool transports sweat away as vapor, helping to regulate your body temperature in varied weather conditions.
  • Comfort Features: Interlock knitting enhances breathability and thermoregulation; flatlock seams minimize chafing for greater comfort during wear.

If you're searching for a reliable base layer for your cold-weather adventures, look no further than the Smartwool Men's Classic Thermal Merino Base Layer Bottom. This fan-favorite garment has been updated with new colors and a fresh fit designed to enhance both functionality and aesthetics. As a part of your winter wardrobe, this base layer promises to keep you comfortable and warm on your next outdoor expedition.

100% Merino Wool Base Layer Mens Pants - Thermal Long Johns

100% Merino Wool Base Layer Mens Pants - Thermal Underwear Long Johns

Pros

  • High Customer Satisfaction: With a rating of 4.6 out of 5, backed by over 3,589 reviews, they have proven popular among buyers.
  • Versatile Use: Ideal for various activities, including skiing, hiking, or lounging at home.
  • Sustainable Material: Being made from merino wool, they are an environmentally friendly choice compared to synthetic materials.

Cons

  • Price Point: They may be more expensive than regular cotton base layers.
  • Care Requirements: Requires careful washing to maintain the quality of the wool.

Key Features

  • 100% Merino Wool: Made entirely from natural fibers, ensuring softness and breathability.
  • Thermal Insulation: Retains heat effectively, making it suitable for cold weather conditions.
  • Moisture-Wicking: Keeps you dry by drawing sweat away from your skin.
  • Odor-Resistant: Naturally resists odors, allowing you to wear them longer without needing frequent washes.
  • Comfortable Fit: Designed to hug your body without restricting movement.

Specifications

  • Material: 100% Merino Wool
  • Available Sizes: S, M, L, XL
  • Color Options: Multiple colors available to suit different preferences.
  • Weight: Lightweight design for easy layering.

The 100% Merino Wool Base Layer Men's Pants are designed for those who value warmth and comfort during chilly days. These thermal underwear long johns are crafted from premium merino wool, providing excellent insulation while remaining breathable. Whether you're engaging in outdoor activities or simply looking for a cozy option to wear at home, these base layer pants offer the functionality and comfort you need.

100% Merino Wool Women's Base Layer Bottoms - Thermal Underwear

100% Merino Wool Women's Base Layer Bottoms - Thermal Underwear - No Itch Renewable Fabric

Pros

  • Extremely soft and comfortable against the skin.
  • Excellent thermal insulation properties without bulkiness.
  • Versatile for outdoor activities such as hiking, skiing, or simply lounging at home.
  • Easy to care for and maintain, retaining its shape and functionality over time.

Cons

  • Higher price point compared to synthetic alternatives.
  • Some users may prefer a tighter fit for more active use.

Key Features

  • Material: Made from 100% merino wool, ensuring superior warmth and breathability.
  • No Itch: The merino wool used is specifically treated to eliminate itchiness.
  • Thermal Performance: Designed to keep you warm in cold conditions while being lightweight.
  • Eco-Friendly: Constructed from renewable resources, making them a sustainable choice.

Specifications

  • Fabric Composition: 100% Merino Wool
  • Care Instructions: Machine washable; follow specific guidelines for best results.
  • Available Sizes: Range of sizes to accommodate different body types.
  • Color Options: Various colors available to suit your style preferences.

The 100% Merino Wool Women's Base Layer Bottoms offer a blend of comfort and functionality that is essential for any outdoor enthusiast or someone looking for reliable thermal underwear. Made from renewable fabric, these bottoms promise not only warmth but also softness without the itchiness often associated with wool. With a solid rating of 4.3 based on 189 reviews, they stand out in the market for women's thermal wear.

Men's 100% Merino Wool Base Layer Pants - Thermal Long Johns

100% Merino Wool Bottoms Men's Base Layer Pants - Long Johns - Thermal Underwear

Pros

  • Exceptional warmth due to the insulating properties of merino wool.
  • Soft fabric feels great against your skin, making them suitable for all-day wear.
  • Breathable material prevents overheating and excessive sweating.
  • Versatile style that can be worn for various activities, from outdoor sports to casual lounging.

Cons

  • Higher price point compared to synthetic alternatives, which may not suit every budget.
  • Some users may find sizing runs small; checking the size chart is advisable.

Key Features

  • 100% Merino Wool Construction: Soft, lightweight, and naturally moisture-wicking for optimal temperature regulation.
  • Warmth without Bulk: Perfectly fitted design allows for easy layering under your regular clothing.
  • Odor Resistant: Natural properties of merino wool help to keep odors at bay, even after prolonged use.
  • Elastic Waistband: Provides a comfortable fit that stays in place without digging into your skin.
  • Machine Washable: Easy to care for with simple washing instructions to maintain quality over time.

Specifications

  • Material: 100% Merino Wool
  • Rating: 4.4 out of 5 based on 22 reviews
  • Available Sizes: Various sizes ranging from S to XXL
  • Care Instructions: Machine wash cold, lay flat to dry

The 100% Merino Wool Bottoms Men's Base Layer Pants are designed to offer you warmth and comfort during those chilly days. As a pair of long johns made from premium merino wool, these thermal underwear pants excel at providing insulation while remaining breathable. Whether you’re hitting the slopes, hiking in cold weather, or simply lounging at home on a winter evening, these base layer pants are an excellent choice.

Arc'teryx Rho Bottom Women's Base Layer - Lightweight & Versatile

Arc'teryx Rho Bottom Women's | Versatile Lightweight Base Layer

Pros

  • Extremely lightweight and breathable material, enhancing your comfort during physical activities.
  • Excellent moisture management properties keep you dry and warm.
  • Versatile design makes it suitable for various activities and weather conditions.
  • Comfortable fit allows for easy layering with other garments.
  • Positive customer feedback with an impressive rating of 5.0 from 4 reviews.

Cons

  • Higher price point compared to basic base layers.
  • Limited color options may not cater to all personal preferences.

Key Features

  • Made from odour-resistant Torrent™ microfleece fabric.
  • Wicking yarns for effective moisture management.
  • Soft brushed interior for added comfort.
  • Stretchy elastane fibres enhance flexibility.
  • Articulated patterning and gusseted crotch for freedom of movement.
  • Comfortable waistband suitable for layering.
  • Smart thigh pocket for storing a smartphone.

Specifications

  • Origin of fabric: Taiwan.
  • Origin of dyeing: Taiwan using Polygiene.
  • Engineered synthetic fibre materials for enhanced performance.
  • Thermally efficient base layer tailored for cool weather use.
  • Multi-use design suitable for diverse activities.

The Arc'teryx Rho Bottom Women's is a versatile lightweight base layer designed for your low to medium output activities on chilly days. With its exceptional design and carefully selected materials, this base layer not only provides warmth but also maximizes comfort. The odour-resistant Torrent™ microfleece fabric ensures that you stay fresh throughout the day, while the wicking yarns efficiently manage moisture.

One of the key highlights of these bottoms is their incredibly soft brushed interior, which feels gentle against your skin. Additionally, the incorporation of elastane fibres offers necessary stretch, allowing for unrestricted movement whether you're out hiking, running, or engaging in other outdoor adventures. The thoughtful design includes an easy-to-layer waistband and a convenient thigh pocket for stashing your smartphone, making it a practical addition to your cold-weather gear.

Men's Long Sleeve Crew Shirt - 100% Merino Wool Base Layer

100% Merino Wool - Men's Long Sleeve Crew Shirt - Thermal Base Layer

Pros

  • Exceptional Warmth: The merino wool material effectively retains heat, keeping you cozy in cold environments.
  • Breathable Fabric: Maintains comfort by allowing air circulation, preventing overheating.
  • Versatile Usage: Great for various activities, including hiking, skiing, or casual outings.
  • Comfortable Fit: Soft fabric feels good against the skin without irritating sensitive areas.
  • Easy Care: Machine washable and retains shape and quality over time.

Cons

  • Price Point: Higher than synthetic alternatives, which may not fit everyone's budget.
  • Care Requirements: Requires specific washing instructions to maintain the integrity of the fibers.

Key Features

  • Made from 100% premium merino wool for optimal warmth and breathability.
  • Long sleeve design provides full coverage and added warmth during colder conditions.
  • Thermal base layer ideal for layering under other clothing in chilly weather.
  • Soft texture that minimizes itching and irritation, suitable for sensitive skin.
  • Natural moisture-wicking properties keep you dry by pulling sweat away from the skin.
  • Odor-resistant qualities ensure the shirt stays fresh even after extended wear.

Specifications

  • Material: 100% Merino Wool
  • Style: Long Sleeve Crew Neck
  • Available Sizes: S, M, L, XL
  • Color Options: Multiple colors available to suit personal preferences.
  • Weight: Lightweight for easy layering.

The 100% Merino Wool Men's Long Sleeve Crew Shirt serves as an exceptional thermal base layer for anyone seeking comfort, warmth, and versatility. Crafted from pure merino wool, this shirt is designed to offer superior insulation while remaining breathable, making it suitable for a variety of activities from outdoor adventures to everyday wear. Users have rated it highly, achieving an impressive rating of 5.0 based on two reviews, indicating a strong level of satisfaction among customers.

Arc'teryx Rho Crew Neck LS Women's Microfleece Base Layer

Arc'teryx Rho Crew Neck LS Women's | Lightweight Microfleece Thermal Base Layer for Women, Moisture Wicking Tops for Hiking

Pros

  • Lightweight and breathable, ideal for active use.
  • Excellent moisture-wicking capabilities.
  • Durable fabric that withstands wear and tear.
  • Odour-resistant, making it suitable for multi-day use.
  • Comfortable fit with minimal bulk under layers.

Cons

  • Some users may find it runs small; sizing up may be necessary.
  • Higher price point compared to some other base layers.

Key Features

  • Torrent™ 190 fabric for moisture management and light warmth.
  • Polygiene® antimicrobial treatment for lasting odour resistance.
  • Crew collar design for reduced bulk under layers.
  • Merrow seam construction to enhance comfort.
  • Ergonomic seam placement to reduce chafing.
  • Fitted design for efficient fabric performance and easy layering.
  • Articulated patterning for improved mobility and comfort.

Specifications

  • Product Name: Arc'teryx Rho Crew Neck LS Women's
  • Fabric: Torrent™ 190
  • Treatment: Polygiene® antimicrobial
  • Fit: Fitted
  • Weight: Lightweight
  • Rating: 4.1 out of 5 based on 8 reviews

The Arc'teryx Rho Crew Neck LS Women's is a high-quality, lightweight thermal base layer designed specifically for women who enjoy outdoor activities such as hiking. Constructed from Torrent™ 190 fabric, this top not only manages moisture effectively but also offers light warmth and performance stretch, making it an excellent choice for variable weather conditions.

One of the standout features of this base layer is its Polygiene® antimicrobial treatment, which helps in providing lasting odour resistance. This means you can stay fresh even during extended wear, making it ideal for long hikes or multi-day trips.

With a crew collar design that reduces bulkiness under layers and merrow seam construction that enhances comfort, the Arc'teryx Rho Crew Neck is tailored for efficiency and ease of movement. The ergonomic seam placement minimizes chafing, allowing you to focus on your adventure without discomfort.

100% Merino Wool Women's Base Layer Pants - Thermal Leggings

100% Merino Wool Base Layer Women Pants - Thermal Leggings Underwear

Pros

  • High warmth-to-weight ratio makes them perfect for various weather conditions.
  • Soft and comfortable fabric gives a gentle touch against the skin.
  • The thermal leggings are versatile enough for both outdoor adventures and everyday use.
  • Machine washable for easy care, retaining shape and performance after washes.
  • Excellent customer satisfaction with a rating of 4.3 based on 3190 reviews.

Cons

  • Higher price point compared to synthetic alternatives.
  • Some users may find them slightly snug; consider sizing up if in between sizes.
  • Requires specific washing instructions to maintain wool quality.

Key Features

  • Material: Made from 100% high-quality merino wool for optimal insulation.
  • Moisture-Wicking: Effectively wicks away sweat to keep you dry and comfortable.
  • Breathable: Allows for excellent airflow, preventing overheating during physical activities.
  • Odor-Resistant: Natural properties of merino wool help to reduce odor buildup over time.
  • Lightweight Design: Perfect for layering without adding bulk to your outfit.

Specifications

  • Material Composition: 100% Merino Wool
  • Available Sizes: XS, S, M, L, XL
  • Care Instructions: Machine wash cold, lay flat to dry.
  • Available Colors: Black, Grey, Navy, and more.

The 100% Merino Wool Base Layer Women Pants are designed to provide exceptional warmth and comfort, making them an ideal choice for outdoor activities or casual wear during colder months. Crafted from premium merino wool, these thermal leggings offer a soft touch against your skin while effectively regulating body temperature, ensuring you stay cozy without overheating.

100% Merino Wool Long Sleeve Thermal Shirt & Socks for Women

100% Merino Wool Base Layer Women - Long Sleeve Thermal Shirt with Socks

Pros

  • Regulates body temperature effectively for comfort in any season.
  • Odor-resistant properties make it great for extended wear.
  • Soft and itch-free fabric ensures all-day comfort.
  • Easy maintenance with machine washable features.
  • Stylish design suitable for multiple occasions.

Cons

  • While affordable, some may find it pricier than typical cotton options.
  • The fitted style may not be suitable for those preferring looser clothing.
  • Requires gentle care to maintain the quality of the fabric.

Key Features

  • Affordable: Enjoy the benefits of wool without straining your budget by replacing your cotton thermals with this value-packed option.
  • Four Season Comfort: The Merino wool composition naturally regulates your body temperature, ensuring you remain comfortable in various climates.
  • Perfect for Travel: Designed for multi-day wear, these thermal garments resist odors and remain comfortable in all conditions.
  • Easy Care: Safe for washer and dryer use, or you can hand wash and lay flat to air dry for longevity.
  • No Worries: Each thermal shirt comes with the Merino.tech promise, providing peace of mind with every purchase.
  • Ideal for Daily Wear: Experience the comfort and functionality of Merino wool tops not just during outdoor activities but in your everyday life.
  • Layering Friendly: The slim fit allows for seamless layering without adding bulk under your outerwear.
  • Itch-Free: Made from ultra-soft 100% Merino wool, these shirts provide comfort throughout the day with no itching.
  • UPF 50+ Protection: Protect yourself from harmful UV rays while enjoying outdoor activities.
  • Versatile Usage: Whether at the gym, on a hiking trail, fishing, skiing, or even at the office, this thermal shirt has you covered.

Specifications

  • Material: 100% Merino Wool
  • Rating: 4.4 out of 5
  • Review Count: 4512 reviews

The 100% Merino Wool Base Layer for Women is a versatile thermal solution that aims to enhance your comfort throughout the year. This long sleeve thermal shirt, paired with matching socks, brings together affordability and high performance, making it an essential addition to your wardrobe.

100% Merino Wool Long Sleeve Base Layer for Men

100% Merino Wool Base Layer Mens - Long Sleeve Thermal Shirts with Socks

Pros

  • Comfortable Fit: The soft texture of the Merino wool ensures all-day comfort.
  • Temperature Regulation: Keeps you warm in the winter and cool in the summer.
  • No Odor: Ideal for extended wear during travel or outdoor activities.
  • Durable: Designed to withstand regular washing and wear.
  • Attractive Design: Stylish enough for both outdoor and indoor settings.

Cons

  • Price Point: More expensive than basic cotton alternatives.
  • Care Instructions: Requires some attention when washing to maintain quality.

Key Features

  • Affordable: Replace your cotton base layers with Merino wool without impacting your budget.
  • Four Season Comfort: Naturally regulates body temperature for year-round wear.
  • Perfect for Travel: Odor-resistant and wrinkle-free design makes it ideal for multi-day use.
  • Easy Care: Washer/dryer safe for hassle-free maintenance.
  • Zero Worries: Backed by the Merino.tech promise for quality assurance.
  • Ideal for Daily Wear: Crafted for everyday comfort beyond just outdoor activities.
  • Great for Layering: Designed to fit comfortably under other clothing without added bulk.
  • Itch-Free: Made from ultra-soft 100% Merino wool for maximum comfort.
  • UPF 20 Protection: Provides sun protection against harmful UV rays.
  • Versatile Use: Suitable for various activities including hiking, skiing, or casual outings.

Specifications

  • Material: 100% Merino Wool
  • Available Sizes: Multiple sizes available for a tailored fit.
  • Color Options: Various colors to choose from, catering to personal style.
  • Weight: Lightweight, making it easy to pack for travels.
  • UPF Rating: 20 for sun protection.

If you’re looking for a high-quality base layer, the 100% Merino Wool Base Layer Mens - Long Sleeve Thermal Shirts with Socks offers a blend of comfort and functionality that’s hard to beat. With a solid rating of 4.5 stars based on over 5,673 reviews, this product stands out in the market for its impressive performance and features.

Arc'teryx Kyanite Women's Baselayer Bottom - Warm Fleece

Arc'teryx Kyanite Baselayer Bottom Women's | Warm Polartec Stretch Fleece Base Layer

Pros

  • Great heat retention for cold weather activities.
  • Comfortable fit that layers easily under other clothing.
  • Functional pocket for convenient storage of essentials.
  • Excellent range of motion thanks to the flexible fabric.

Cons

  • Higher price point compared to basic baselayers on the market.
  • Limited color options may not appeal to everyone's taste.

Key Features

  • Polartec® Power Stretch® Pro fabric for durability and warmth.
  • Moisture-wicking brushed polyester interior that keeps you dry.
  • Zippered thigh pocket suitable for storing your smartphone securely.
  • Trim fit design enhances thermal efficiency and layering capability.
  • Performance stretch material allows for excellent freedom of movement.
  • Articulated patterning tailored for enhanced mobility.

Specifications

  • Rating: 4.4 out of 5
  • Review Count: 9
  • Material: Polartec® Power Stretch® Pro
  • Fit: Trim fit designed for layering.

The Arc'teryx Kyanite Baselayer Bottom Women's is designed with a focus on warmth and comfort for outdoor enthusiasts. Constructed from Polartec® Power Stretch® Pro, this base layer features a durable nylon exterior complemented by a soft, moisture-wicking brushed polyester interior. Whether you're hitting the slopes or enjoying a winter hike, this baselayer is engineered to keep you cozy while allowing for optimal mobility.

100% Merino Wool Women's Midweight Base Layer - Long Sleeve Crew

100% Merino Wool - Women's Midweight Base Layer - Long Sleeve Crew

Pros

  • Exceptional warmth without bulk, making it easy to layer.
  • Soft and non-itchy fabric, ideal for sensitive skin.
  • Highly durable, maintaining shape and performance even after multiple washes.
  • Versatile enough for various activities, including hiking, skiing, or everyday wear.

Cons

  • Higher price point compared to synthetic alternatives.
  • Requires gentle washing to maintain the quality of the fabric.
  • Limited color options may not appeal to all consumers.

Key Features

  • Premium Material: Made from 100% high-quality merino wool for superior softness and breathability.
  • Midweight Design: Offers the perfect balance between warmth and versatility, suitable for layering or wearing alone.
  • Naturally Odor Resistant: Merino wool has natural properties that resist odors, keeping your base layer fresh for longer.
  • Moisture Management: Excellent at wicking away sweat, helping to keep you dry during physical activities.
  • Comfortable Fit: Designed with a relaxed fit that allows for easy movement while retaining warmth.

Specifications

  • Material: 100% Merino Wool
  • Weight: Midweight
  • Fit: Relaxed
  • Rating: 4.3 out of 5 based on 67 reviews

The 100% Merino Wool - Women's Midweight Base Layer - Long Sleeve Crew is designed to provide you with exceptional warmth and comfort, making it an ideal choice for both outdoor activities and casual wear. Crafted entirely from premium merino wool, this base layer excels in moisture-wicking and temperature regulation, ensuring you stay dry and comfortable no matter the conditions.

100% Merino Wool Women's Midweight Base Layer Long Sleeve

100% Merino Wool - Women's Midweight Base Layer - Long Sleeve Crew

Pros

  • Highly breathable, ensuring you remain comfortable during physical activities.
  • Soft against the skin, reducing the likelihood of irritation.
  • Effective at regulating body temperature in varying conditions.
  • Durable fabric that withstands regular use and washing.
  • Stylish design that can transition from outdoor settings to casual wear effortlessly.

Cons

  • Can be more expensive compared to synthetic alternatives.
  • Requires careful washing to maintain its quality and shape.
  • May not provide as much insulation as thicker wool options for extremely cold weather.

Key Features

  • Material: 100% Merino wool for superior softness and breathability.
  • Midweight Design: Offers a perfect balance of warmth without being overly bulky.
  • Moisture-Wicking: Effectively wicks away sweat to keep you dry and comfortable.
  • Odor Resistance: Naturally resistant to odors, allowing for longer wear between washes.
  • Versatile Use: Suitable for layering under jackets or wearing alone for casual use.

Specifications

  • Rating: 4.6 out of 5 stars based on 287 reviews.
  • Available Sizes: S, M, L, XL - ensure you check the size chart before purchasing.
  • Care Instructions: Hand wash recommended; lay flat to dry for best results.

The 100% Merino Wool - Women's Midweight Base Layer - Long Sleeve Crew is designed to provide you with exceptional warmth and comfort during your outdoor activities. Made from high-quality merino wool, this base layer excels in temperature regulation, making it an ideal choice for various weather conditions. Whether you're skiing, hiking, or simply enjoying a chilly day outside, this long sleeve crew will be your reliable companion.

Smartwool Women's Thermal Merino Base Layer Bottoms

Smartwool Women's Classic Thermal Merino Base Layer Bottom

Pros

  • Highly rated with a customer rating of 4.5 out of 5, reflecting overall satisfaction.
  • Lightweight yet warm, making it ideal for layering in cold weather.
  • Versatile enough for multiple outdoor activities.
  • Available in a range of sizes to accommodate different body types.

Cons

  • Some users report that the sizing runs slightly smaller than expected, so consider ordering a size up.
  • The price point may be higher than some competitors, which could be a consideration for budget-conscious shoppers.

Key Features

  • Merino Wool Fabric: Crafted from high-quality merino wool, known for its thermal-regulating properties.
  • Moisture-Wicking: Effectively wicks away sweat to keep you dry during your activities.
  • Comfortable Fit: Features a stretchy, soft construction that ensures a snug fit without being restrictive.
  • Durable Design: Engineered to withstand various outdoor conditions while maintaining comfort.
  • Easy Care: Machine washable for convenient cleaning after your adventures.

Specifications

  • Material: 100% Merino Wool
  • Weight: Lightweight fabric for easy movement
  • Care Instructions: Machine wash, tumble dry low
  • Rating: 4.5 based on 828 reviews

The Smartwool Women's Classic Thermal Merino Base Layer Bottom is designed to keep you warm and comfortable, making it an excellent choice for outdoor enthusiasts. Whether you're skiing, hiking, or simply enjoying a chilly day, this base layer provides the insulation you need without compromising on breathability.

Arc'teryx Satoro Merino Wool Bottom for Women

Arc'teryx Satoro Merino Wool Bottom Women's

Pros

  • Highly breathable, keeping you comfortable during physical activities
  • Soft texture that feels great against the skin
  • Durable construction that withstands regular use
  • Effective moisture-wicking capabilities
  • Versatile for various outdoor activities and casual wear

Cons

  • Higher price point compared to synthetic alternatives
  • May require special care when washing to maintain quality
  • Sizes may run small for some users, so careful sizing is recommended

Key Features

  • Made from RWS certified Merino wool for sustainability and quality
  • Exceptional thermal regulation for comfort in varying temperatures
  • Odour and static resistant for prolonged wear
  • Next-to-skin fit enhances moisture transfer and efficiency
  • Blended with elastane for added stretch and mobility
  • High-rise knot waistband provides a secure and comfortable fit
  • Laminated thigh pocket with zipper for secure storage of small items

Specifications

  • Material: Responsible Wool Standard certified Merino wool blended with elastane
  • Fit: Next-to-skin
  • Waistband: High-rise knot design
  • Pocket: One laminated thigh pocket with zipper
  • Weight: Lightweight for easy layering
  • Care Instructions: Hand wash or machine wash on gentle cycle

The Arc'teryx Satoro Merino Wool Bottom for women is designed to provide exceptional performance in various conditions. Made from Responsible Wool Standard (RWS) certified Merino wool, these bottoms are crafted to regulate your thermal comfort while ensuring you remain odour-free and static-free. With a focus on comfort, the fabric blend includes elastane fibers that offer stretch and mobility, making them ideal for layering under other garments.

Men's Thermal Pants Long Johns - 4 or 2 Pack Fleece Lined

4 or 2 Pack Men's Thermal Pants Long Johns Bottom Fleece Lined Base Layer

Pros

  • Excellent warmth retention due to the fleece lining.
  • High customer satisfaction reflected in the solid rating.
  • Affordable multi-pack options offer great value for money.
  • Comfortable fit allows for unrestricted movement.
  • Easy to care for with machine-washable fabric.

Cons

  • Some users may find them slightly bulky under tighter clothing.
  • Lack of color variety may not meet all preferences.
  • The elastic waistband could feel tight for individuals with larger waist sizes.

Key Features

  • Material: Made from a soft fleece lining that traps heat while remaining breathable.
  • Design: Long john style ensures full coverage and ease of movement.
  • Pack Options: Available in either a 4-pack or a 2-pack, allowing you to choose based on your needs.
  • Temperature Regulation: Engineered to wick moisture away, keeping you dry even in cold conditions.
  • Versatile Use: Suitable for layering under jeans, trousers, or for wearing alone during lounging around the house.

Specifications

  • Material Composition: 95% Polyester, 5% Spandex.
  • Available Sizes: S, M, L, XL, XXL.
  • Care Instructions: Machine wash cold, tumble dry low.
  • Weight: Lightweight design makes them ideal as a base layer.

The 4 or 2 Pack Men's Thermal Pants Long Johns Bottom Fleece Lined Base Layer are designed to provide warmth and comfort during colder months. With a rating of 4.4 from over 212 reviews, these thermal pants have quickly become a popular choice for those seeking reliable base layers. Perfect for outdoor activities or staying cozy at home, you can count on these thermal pants to keep you warm without sacrificing mobility.

Men's Thermal Pants Long Johns - Fleece Lined Base Layer

4 or 2 Pack Men's Thermal Pants Long Johns Bottom Fleece Lined Base Layer

Pros

  • High Warmth Retention: Users appreciate the excellent insulation provided by the fleece lining.
  • Comfortable Fit: Many reviewers mention the snug yet comfortable fit that doesn't compromise on mobility.
  • Durability: Made with quality materials, these thermal pants hold up well after multiple washes.
  • Affordable: Given the quality and pack options, these thermal pants offer good value for the price.

Cons

  • Limited Color Choices: Some users have noted a lack of variety in color options.
  • Sizing Issues: A few reviews mention discrepancies in sizing, so it’s advisable to check the size chart before purchasing.

Key Features

  • Fleece Lined: The interior of the pants is lined with soft fleece, enhancing insulation and comfort against the skin.
  • Base Layer Fit: Designed to be worn as a base layer, these thermal pants fit snugly without being restrictive, making them ideal for layering under other clothing.
  • Multiple Pack Options: Available in both 4-pack and 2-pack options, allowing you to choose the quantity that suits your needs best.
  • Moisture-Wicking: The fabric effectively wicks moisture away from the body, helping you stay dry during physical activities.
  • Versatile Use: Perfect for outdoor activities like skiing, hiking, or simply lounging at home during winter.

Specifications

  • Material: Polyester blend with fleece lining.
  • Available Sizes: S, M, L, XL.
  • Care Instructions: Machine washable; tumble dry low.
  • Country of Origin: Imported.

The 4 or 2 Pack Men's Thermal Pants Long Johns Bottom Fleece Lined Base Layer are designed to provide exceptional warmth and comfort during colder months. With a commendable rating of 4.6 from 179 reviews, these thermal pants stand out as a reliable choice for anyone looking to keep warm while maintaining mobility.

Men's Thermal Long Johns - Cold Weather Base Layer Bottoms

Men's Thermal Underwear Long Johns Cold Weather Base Layer Bottoms

Pros

  • Highly Warm: Keeps you insulated during frigid weather.
  • Versatile: Pairs well with various tops for different activities.
  • Multiple Sizes: Accommodates a wide range of body types.
  • Durability: Designed to handle rigorous use, ideal for outdoor sports and military duties.

Cons

  • Limited Color Choices: While there are multiple colors, some may find the selection too narrow.
  • Fit Issues: Sizing might not suit all body shapes perfectly; it's advisable to check the size chart carefully.

Key Features

  • Exceptional warmth through advanced synthetic material.
  • Available in a wide range of sizes from XS to 6XL.
  • Multiple color options including solid black, tactical camo, pure white, green, navy, and blue.
  • Designed to be breathable yet insulating, perfect as a base layer.
  • Durable construction that withstands various outdoor activities.

Specifications

  • Material: Synthetic fabric for warmth and breathability.
  • Rating: 4.6 out of 5 based on 750 reviews.
  • Size Range: XS to 6XL, ensuring inclusivity.
  • Color Options: Black, Tactical Camo, White, Green, Navy, Blue.

The Men's Thermal Underwear Long Johns are a reliable choice for anyone needing high-quality base layer bottoms designed to combat the chill of cold weather. Made from synthetic materials, these long johns ensure that you stay warm without feeling restricted by cheap or thin garments. They pair well with various tops, making them versatile enough for different occasions, whether you are on military duty, engaging in sports like football or soccer, or enjoying a motorcycle ride in freezing temperatures.

100% Merino Wool Tank Top Men - Sleeveless Base Layer

100% Merino Wool Tank Top Men - Active Undershirt Sleeveless Base Layer

Pros

  • Excellent moisture management keeps you dry and fresh.
  • Highly breathable fabric ensures comfort during intense workouts.
  • Natural odor resistance helps maintain freshness even after prolonged use.
  • Versatile enough to be worn alone or layered under other clothing.
  • Easy to care for, as Merino wool is machine washable in most cases.

Cons

  • Higher price point compared to synthetic alternatives.
  • Some users may find the fit slightly snug; it's recommended to check sizing before purchasing.
  • Requires careful washing instructions to maintain its shape and quality.

Key Features

  • Made from 100% Merino wool for natural breathability and moisture-wicking capabilities.
  • Sleeveless design allows for a full range of motion during physical activities.
  • Soft texture that feels comfortable against the skin, reducing irritation.
  • Thermal regulation properties keep you warm in cold conditions and cool in warm weather.
  • Durable and lightweight, perfect for layering without adding bulk.

Specifications

  • Material: 100% Merino Wool
  • Type: Sleeveless Base Layer
  • Care Instructions: Machine wash on gentle cycle
  • Available Sizes: S, M, L, XL
  • Color Options: Various colors available

The 100% Merino Wool Tank Top for Men is an essential piece for anyone seeking a premium active undershirt. Designed to be worn as a sleeveless base layer, this tank top combines functionality with comfort, making it suitable for various activities, whether you're hitting the gym or enjoying a casual day out. With a rating of 4.3 from 213 reviews, it has garnered attention for its quality and performance.

Men's Microweight 1/4 Zip Mock Neck Merino Wool Shirt

Men's Microweight 1/4 Zip Mock Neck - Base Layer Shirt - Merino Wool Thermal Top

Pros

  • Offers excellent insulation while remaining lightweight.
  • Soft texture reduces irritation against the skin.
  • The 1/4 zip feature provides customizable ventilation.
  • Durable material holds up well over time with proper care.
  • Highly rated by users for warmth retention during winter activities.

Cons

  • Some users may find it slightly pricey compared to synthetic alternatives.
  • The fit may be snug for individuals who prefer a more relaxed style.
  • Requires special washing instructions to maintain merino wool quality.

Key Features

  • Constructed from premium merino wool for superior warmth and comfort.
  • 1/4 zip mock neck design allows for easy temperature regulation.
  • Lightweight and breathable, perfect for layering under other garments.
  • Moisture-wicking properties keep you dry during physical activities.
  • Available in multiple sizes to fit various body types.

Specifications

  • Material: Merino Wool
  • Weight: Microweight
  • Neckline: 1/4 Zip Mock Neck
  • Available Sizes: S, M, L, XL
  • Care Instructions: Machine washable on gentle cycle; air dry recommended

The Men's Microweight 1/4 Zip Mock Neck Base Layer Shirt is a thermal top designed to provide warmth and comfort during cold weather activities. Made from high-quality merino wool, this shirt is ideal for those who seek performance and versatility in their base layer clothing.

This base layer offers an excellent balance of breathability and insulation, making it suitable for various outdoor settings, whether you're skiing, hiking, or simply enjoying a cold day outdoors. Its microweight construction ensures that you stay warm without feeling bulky.

The 20 Best Long Underwear – Price, Ratings, Reviews & Sales Insights

Product Name Image Price Rating Review Count Expert ScoreSales Last MonthBuy
Thermal Underwear for Men - Fleece Lined Long Johns Set$28.99
(4.6)
14162 97 200 Get it on Amazon
Mens Thermal Underwear Long Johns Set for Cold Weather$27.99
(4.6)
11826 88 100 Get it on Amazon
100% Merino Wool Women's Base Layer Pants - Thermal Leggings$59.95
(4.3)
3190 79 100 Get it on Amazon
100% Merino Wool Base Layer Mens Pants - Thermal Long Johns$53.09
(4.6)
3589 77 50 Get it on Amazon
100% Merino Wool Long Sleeve Thermal Shirt & Socks for Women$58.99
(4.4)
4512 77 50 Get it on Amazon
Arc'teryx Rho Bottom Women's Base Layer - Lightweight & VersatileUnlock the price
(5.0)
4 76 10 Get it on Amazon
Thermal Underwear Long Johns for Men - Cold Weather Set$24.99
(4.6)
4509 76 10 Get it on Amazon
100% Merino Wool Long Sleeve Base Layer for Men$49.99
(4.5)
5673 75 10 Get it on Amazon
Thermal Underwear for Men - Fleece Lined Long Johns$9.99
(4.9)
27 75 10 Get it on Amazon
Men's Fleece Lined Thermal Underwear Long Johns Set$19.99
(4.9)
20 75 10 Get it on Amazon
Arc'teryx Satoro Merino Wool Bottom for WomenUnlock the price
(4.7)
5 74 10 Get it on Amazon
Arc'teryx Kyanite Women's Zip Neck Baselayer - Polartec FleeceUnlock the price
(4.7)
14 74 10 Get it on Amazon
Pudolla Men's Thermal Long Sleeve Running Shirt$19.99
(4.8)
23 74 10 Get it on Amazon
Smartwool Men's Hike Light Cushion Low Ankle Socks$19.99
(4.7)
487 74 10 Get it on Amazon
Men's Long Sleeve Crew Shirt - 100% Merino Wool Base Layer$79.99
(5.0)
2 73 10 Get it on Amazon
Men's Thermal Pants Long Johns - Fleece Lined Base Layer$22.99
(4.6)
179 73 10 Get it on Amazon
Men's Thermal Long Johns - Cold Weather Base Layer Bottoms$39.99
(4.6)
750 73 10 Get it on Amazon
MERIWOOL Women's Midweight Merino Wool Long Sleeve Shirt$65.0
(4.6)
2174 73 10 Get it on Amazon
100% Merino Wool Balaclava - Winter Ski Mask$25.99
(4.4)
1591 73 10 Get it on Amazon
100% Merino Wool Beanie Kids - Unisex Toddler Hat$19.99
(4.6)
211 73 10 Get it on Amazon
MERIWOOL Womens Merino Wool Thermal Base Layer Pants$62.0
(4.6)
2206 73 10 Get it on Amazon
100% Merino Wool Women's Midweight Base Layer - Long Sleeve CrewUnlock the price
(4.3)
67 72 10 Get it on Amazon
Men's Thermal Pants Long Johns - 4 or 2 Pack Fleece Lined$32.99
(4.4)
212 72 10 Get it on Amazon
100% Merino Wool Tank Top for Women - Active Sleeveless Base Layer$44.99
(4.4)
549 72 10 Get it on Amazon
BAMBOO COOL Men's Thermal Underwear - Lightweight Fleece Lined$39.09
(4.5)
252 72 10 Get it on Amazon
BAMBOO COOL Men's Lightweight Thermal Underwear$39.09
(4.5)
252 72 10 Get it on Amazon
100% Merino Wool Women's Midweight Base Layer Long Sleeve$89.99
(4.6)
287 71 10 Get it on Amazon
100% Merino Wool Tank Top Men - Sleeveless Base Layer$44.99
(4.3)
213 71 10 Get it on Amazon
METARINO Men's Merino Wool Midweight Base Layer$38.99
(4.4)
5 71 10 Get it on Amazon
Merino Wool Long Sleeve Polo for Men | Merino Tech$59.99
(4.3)
932 71 10 Get it on Amazon
Smartwool Men's Classic Thermal Merino Base Layer Bottom$125.0
(4.7)
641 70 10 Get it on Amazon
Men's 100% Merino Wool Base Layer Pants - Thermal Long Johns$89.99
(4.4)
22 70 10 Get it on Amazon
Arc'teryx Kyanite Women's Baselayer Bottom - Warm Fleece$72.0
(4.4)
9 70 10 Get it on Amazon
Smartwool Women's Thermal Merino Base Layer Bottoms$109.0
(4.5)
828 70 10 Get it on Amazon
100% Merino Wool Lightweight Boxer Briefs for Men$44.99
(4.2)
459 70 10 Get it on Amazon
Men’s Midweight Quarter Zip Pullover - 100% Merino Wool$109.99
(4.6)
649 70 10 Get it on Amazon
100% Merino Wool Midweight Women's 1/4 Zip Midlayer$109.99
(4.5)
418 70 10 Get it on Amazon
100% Merino Wool Women's Base Layer Bottoms - Thermal Underwear$89.99
(4.3)
189 69 10 Get it on Amazon
Arc'teryx Rho Crew Neck LS Women's Microfleece Base Layer$72.45
(4.1)
8 69 10 Get it on Amazon
Arc'teryx Kyanite Women's Baselayer Crew Neck - Warm Stretch-Fleece$75.6
(4.1)
5 69 10 Get it on Amazon
Merino Wool Base Layer Women's Thermal Leggings$45.99
(4.0)
47 69 10 Get it on Amazon
Minus33 Merino Wool Men's Saratoga Lightweight BottomsUnlock the price
(3.7)
10 69 10 Get it on Amazon
SmartWool Men's Perfect Crew Short Sleeve Tee$59.0
(4.1)
64 69 10 Get it on Amazon
Minus33 Merino Wool Women's Magalloway Lightweight BottomUnlock the price
(3.7)
10 69 10 Get it on Amazon
Men's Microweight 1/4 Zip Mock Neck Merino Wool Shirt$94.99
(4.2)
50 68 10 Get it on Amazon
Terramar Men's Silk Thermasilk Baselayer Bottom Pant$37.95
(3.8)
72 68 10 Get it on Amazon
Womens Briefs - 84% Merino Wool Athletic Underwear$32.99
(3.6)
49 68 10 Get it on Amazon
Arc'teryx Essent High-Rise Utility Legging 26' Women's$140.0
(4.0)
2 66 10 Get it on Amazon
Minus33 Merino Wool Women's Moriah Lightweight CrewUnlock the price
(3.1)
4 66 10 Get it on Amazon